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H3

An atom of H-3

Helium-3 (He-3) is a light, non-radioactive isotope of helium with two protons and one neutron. It is rare on Earth, and it is sought for use in nuclear fusion research. The abundance of helium-3 is thought to be greater on the Moon (embedded in the upper layer of regolith by the solar wind over billions of years),[1] though still lower in quantity (28 ppm of lunar regolith is helium-4 and from one to 50 ppb is helium-3)[2][3] than the solar system's gas giants (left over from the original solar nebula)!

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